Move SkASAN.h to include/private/base.

This will make it accessible to SkTArray.h.

Bug: b/40044929
Change-Id: I64d3007ebe6bbb4df564418508801bcba12ca155
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/841538
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
7 files changed